1 Scope This Specification specified the design requirements for the layout of metallic piping such as carbon steel, alloy steel and stainless steel piping. This Specification is applicable to the design for the layout of metallic piping such as carbon steel, alloy steel and stainless steel piping in the new, extended and renovated petrochemical engineering, not applicable to the design layout of nonmetallic piping and underground water supply and drainage piping.2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.